Steam-regulated exhaust nozzle



Jan. 22 1924.

- 1,481,337 c. L. BAKER STEAM REGULATED EXHAUST NOZZLE Filed Feb. 10 1921 2 Sheets-Sheet 1 Jan. 22 ,'1924.-

C. L. BAKER STEAM REGULATED EXHAUST NOZZLE;

Filed Feb. 10. 1921 2 Sheets-Sheet z /JIIIII Patented Jan. 22, 1924.

UNITED STATES rear critics,

CHARLES LESLIE BAKER, or sr. JOSEPH, mssounr.

,S'IEAM-REGULATED EXHAUST NOZZLE.

A lication filed February 10, 1 92 1. Serial No. 443,974.

1. enable others skilled in the art to'which it appertains to make and use the same.

This invention relates to new and useful improvements in exhaust nozzle regulating mechanisms, and particularly to an 1m- 1 provement over the prior patent issuedto myself October 22, 1912, and numbered 1,042,070.

The particular improvement consists in providing a steam motor for opening and closing the gates or valves at the tipof the exhaust nozzle of a railway locomotive.

One object of the invention is topro'vide a means for automatically moving the ates or valves into open or closed position w ich is controllable from the cab of the locomotive, by the engineer.

Another object is to provide a motor of this character which is actuated forwardly by steam pressure and restored .to normal position by spring pressure.

Other objects and advantages will be apparent from the following description. when taken in connection with the accompanying drawings. g

In the drawings:

Figure 1 is a top plan view of the exhaust nozzle and operating means, the locomotive 7 being shown in section.

Figure 2 is an enlarged vertical longitudinal sectional view through the steam motor which actuates the gates or valves of the nozzle.

Figure 3 is a vertical transverse sectional view through the gear end portion of the casing of the motor, on the line 33 of Figure 2.

Figure 4 is a vertical transverse sectional view through the motor casing, on the line 4-4 of Figure 2, showing the door through which access isobtained to the interior of the casing.

Figure 5 is a vertical transverse sectional view through the casing, on the line 5-5 of Figure 2, showing the guide for the rack bar.

Referring particularly to the accompanying drawings, representsthe shell ofthe smoke box of the locomotive, 11 the exhaust nozzle, and 12 the gates or valves mounted on the tip of the nozzle and actuated'into open or closed position by means of the oppositely threaded shaft 13 which engages the bifurcatedprojections 14of the gates.

On the outside'of the shell 10 an elongated 'casingl5 issecured bym'eans of the bolts 16, said casing having a removable cover 17, secured to the caslng by means of the bolts 18. The forward' end of the casing 15 is slightly enlarged at its lower portion, and extending transversely through the center of this portion of the casing is a shaft 19, on which are keyed the gears and 21, the

' former being larger in diameter than'the latter. Also extending through this portion of the casing, and below the shaft 19, is a shaft 22 on which iskeyed a gear 23 which meshes with the gear 20, said shaft extend ing through the inner sidewall of the Catsing and through the bushing 241, which is secured within an opening in the wall or shell 10, and into the smokebox. The innerfend of the shaft 22 is connected with the adjacent; end of the threaded shaft 13 by means of the coupling 25. Mounted within the casing 15, above and parallel with the shaft 19, is a stub shaft 26 on which is rotatably supported a roller 2?. Depending 'fro'nrthetop wall of the casing is a web 28 and formed in one side of this web is a transverse groove29 in which is slidably disposeda rackbar 30, said rack bar extending longitudinally within the casing and engaging with the gear 21, with its back or upper edge held in alignment against the roller 27, and between the flanges 27 on the roller.

The other end wall of the casing is formed with a central opening 31, through which the reduced and cylindrical portion 32 of the rack bar is slidably disposed. The cylindrical portion of the rack bar, within the casing is threaded to receive thereon the nuts 33 and 34, the latter of which has a reduced extension 34 which is received in the adjacent end of the coil spring 35 which is disposed in encircling relation to the rack bar, and bears with its other end against the rack bar guide 28. In this portion of the casing there is formed an access opening 36, which is covered by a hinged door 37, the same being retained in closed position by the latch 38. A removable .Ill

admit steam to the cylinder-against thepis ton, as will be readily understood. This cylinder is covered with asbestos, as

shown at 43. In the pipeflQ is disposed a two way coupling 4;l,-the branch 44: leading to a lubricator valve, .not shown, while the branch 4% leads to a drain valve not ,shown. The pipe 42 leads to a globe .valve located in the cab of the locomotive, but not shown by means of which steam ,is ad- ;mitted to the pipe to be conveyed to the cylinder and against the piston to drive the piston towardthe other end of the cylinder,

and therebypausethe rack bar'to rotatethe shaft 19, by its engagement .with the gear 21, ,and ;by this rotation of the shaft 19, the

gear 20 will cause the shaft 221:0 rotate, by the meshing of the gear 21 with the gear .23. The rotation of the-shaft 22, through the coupling 25, causesthe rotation of the threaded shaft '13, and the swinging of the gates '12 into closed or partially closed position. VVhen the steam pressure is reduced or cut off from the cylinder 40 the spring, which was compressed under the previously mentioned movement of the piston, is ,per-

mitted to again expand to normal position, ,and rotate the shafts and gears so vas to move thegates towardopen position. .When .the steam pressure is high the piston will be movedforwa-rdly to swing the gates toward closed position, and thereby reduce the size of the opening atthe tip of the exhaust nozzle, and when the pressure is. reduced, the spring exerts ,pressureto move the piston back and therebyrotatethe shaft 13 to swing thegates toward .open' position.

When it is desired to change the tension of the spring 35, the door 37 is swung into open position, and by reaching through the o pening 36 the nuts33 and 34: can be turned.

"By removing the cover 17, access to all ofthe mechanism, within the casing be read ily had for adjustments or repairs.

What is claimed is:

1. An actuating mechanism for the draft control of a steam boiler furnace comprising a casing, a depending web in one end of said casing, said webbeing formed with a transverse groove, a rack bar slidable through said groove, a guide roller positioned above the rack bar and contacting therewith, and a rack bar retaining plate secured ,to they said web andsp'anning said ,groove. 1 p 2. An actuating mechanism for the draft control of a steam boiler furnace comprising a casing having an enlarged forward end portion, a depending web formed in the enlarged portionof the casing, said web be- .ing provided with a transverse groove, a ,rgackbar slidable through saidgroove, a rack bar retaining plate secured to the said web andspanningsaid groove, anda door formed in thesn aller end portion of the casing.

" .3. "An actuating mechanism for the draft control .of a steam boiler furnace comprisinga casing, a depending web formed in the forward end of the casing, said web being ,provided with ,a transverse groove, 21. rack ,bar slidable throughthe groove, means cooperating with the bar for operating the shutters of a; draft controharackbar retain- .ingplate securedto the said web and spangroove,anda door for said casing.

In'testimony whereof, I affix my signature,.in thepresenc efof two witnesses.

T H GHARLESLESLIE BAKER. ytlitnesses: n

ARDEY GABBERT, LILLIAN THOMAS. 

